Shut-off valve for oil-wells



(No Model.)

REVANS. 'SHUT-OFP VALVE PoR OIL WELLS. No. 469,996. Patented Mar. 1, 1892.

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STATES EVAN EVANS, OF KAYLOR, PENNSYLVANIA.

SHUT-OFF VALVE FOR OIL-WELLS.

SPECIFICATION forming part of Letters Patent N o. 469,996, dated March 1, 1892.

Application filed September 17, 1891. Serial No. 405,979. (No model.)

To all whom. it' may concern:

Be it known that I, EVANl EVANS, of Kaylor, in the county of Armstrong and State of Pennsylvania, have invented certain new and useful Improvements in Shut-Off Valves for Oil-Vells; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilledin the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvementin shut-oit' valves for oil-wells; and it consists in the construction and arrangement of parts,

which will be fullydescribed hereinafter, and

particularly referred to in the claims.

The object of my invention is to provide a shut-oit valve to be applied to the lower end of the working barrel of an oil-well for the purpose of preventing the oil from running back through the well to the rock when the working rods and valves are removed for the purpose of repair, or for the purpose of changing the cup leather packing, which has to be done frequently.

In the drawings, Figure l is a side view of a shut-off valve which embodies my invention. Fig. 2 is a vertical section of the same, taken through the center. Fig. 3 is a longitudinal sectional view, showing the relative position of the shut-0E valve to the workin g barrel.

My cutoff valve consists of an upper hollow perforated portion` A, which has an upper perforated top or end B. Screwed or otherwise secured in the lower end of this casing A is a valve-seat C, which extends down below the casing A a suitable distance and has its lower end screw-threaded, shown. Screwed upon this screw-threaded lower end of the valve-seat C is a ring D, which has extending downward therefrom ayokeE, which is provided with a vertical opening F, through which the valve-rod G passes and is guided. This yoke also acts asa support for the spiral spring'H, which is placed around the valvestem G, and has its upper end engaging the under side of the valve I and holds the valve normally upward, as shown in Fig. 2.

Placed between the upper edge of the yokering D and the lower edge of the casing A is a suitable packing J, which makes a tight tit of the shut-off valve in the lower end of the working barrel. This packing is placed tightly in the lower end of the barrel and supports the casing in position therein.

Vhere a shut-oft valve is not used, when the working valves are removed for any purpose, which has to be done frequently, all of the oil and water rush back upon the oil` rock, which is very damaging to the well, and it is this that I desire to prevent by the use of my valve. By placing my valve in the lower end of the working barrel and placing a packing in the well between the water and oil bearingstratums, when the workin g valves are removed the pressure of the oil yin the tubing closes the valve against the pressure of the spring and holds all of the oil in the tubing until the working valves are placedin position again. Then as soon as the working valves are started, the pressure is removed from the shut-olf valve and the spring forces it upward, allowing afree iow of oil through the shut-off valve from the rock. lWhere ashut-off valve is not used and the working valves are removed for changing the cup leather packing, or for any other purpose, one or two days production is lost, owing to the fluid rushing back to the rock; but where my valve isused there is no loss of fluid, and when the working valves are replaced'and started the oil begins to flow at once; also, by the use of this valve I do not have to use any standing valve, but use a ch eck-valve at the top of the working barrel. IVhen the piston-rod is removed, all ot' the valves are removed with it, so that they can be examined, while my valve remains in place in the lower end of the working barrel and prevents any backward flow of the fluid.

My shut-off valve has no operation or func` tion as long as the working valves are in operation; but as soon as they are removed the pressureof the fluid in the well closes the valve'and prevents it from rushing back to the oil-rock.

By means of a valve of the above-described construction I produce a very cheap and sim-V ple means for preventing damage to oil-wells and a loss of fluid by preventing it from flowing back to the rock. The lower end of the valve-stem is screwthreaded and extends through the yoke, as shown, and has applied IOO thereto a screw-nut M, by nieans of which the valve can be brought down upon the spring and thus the tension of the spring regulated, as will be readily understood.

Having thus described my invention, I claimu l. A shut-oit valve for oil-wells, consisting of a perforated casing having avalve-seat in side thereof at its lower end, a valve placed inside of the said casing above the said seat, a valve-stein and a yoke Vthrough which the valve-stem passes, and a spring which is placed between the yoke and the valve for holding it normally up out of contactwith its seat, substantially as specified.

2. A shut-oit valve for oil-wells, comprising a perforated casing, a valve-seat placed in its lower end having ascrew-threaded lower end, a yoke placed upon the screw-threaded lower end of the said seat, a valve within the casing above the said seat, a valve-stern passing through the yoke, and a spring having one end placed upon the yoke and its other end forcing the valve upward, substantially as specified.

3. In a shut-ott valve for oil-wells, a perforated casing having avalve-seat placed in its l EVAN EVANS. \Vitnesses:

EDGAR M. ADAMS, GEORGE ADAMS. 

